Mounting for an adjustable power tool, including a wedge type lock



Jan. 5, 1960 c. G. JOA

MOUNTING FOR AN ADJUSTABLE POWER TOOL, INCLUDING A WEDGE TYPE LOCK 2 Sheets-Sheet 1 Filed March 11, 1958 INVENTOR. Caer- 6. Jan

A 7' TOENEYS 2,919,730- UDING Jan. 5, 1960 c. G. JOA

MOUNTING FOR AN ADJUSTABLE POWER TOOL, INCL A WEDGE TYPE LOCK 2 Sheets-Sheet 2 Filed March 11, 1958 IN VEN TOR. CUE? 6. \I/OH BY W, my w ATTOENEYS United States Patent MOUNTING FOR AN ADJUSTABLE POWER TOOL, INCLUDING A WEDGE TYPE LOCK Curt George Joa, Ocean Ridge, Fla., assignor to Kohler- Joa Corporation, Shcboygan Falls, Wis., a corporation of Wisconsin Application March 11, 1958, Serial No. 720,628

12 Claims. (Cl. 144-134) This invention relates to a mounting for an adjustable power tool, including a wedge type lock.

While the invention is not limited to any particular machine, the embodiment disclosed for exemplification shows power tools of the type suitable for mounting on woodworking machines.

In the device of the present invention and adjustable power tool, such as a motor driven circular saw, dado cutter, etc. is mounted both for reciprocation and oscillation with respect to its support. In the preferred embodiment coaxial screws respectively move a tool support carriage rectilinearly and rotate a turntable on which the tool is mounted. Accordingly, the tool can be quickly and accurately positioned with respect to the work. Moreover, the turntable upon which the power tool is mounted may be instantly locked or released by manipulation of a wedge lock which coacts with a turntable clamp. In the preferred embodiment of the invention, the clamp consists of a stem which is coaxial with the turntable and which frictionally binds the turntable against a fixed shoulder.

Details of the device of the present invention and other objects and advantages thereof will appear from the following disclosure in which:

Figure 1 is a side elevation of a woodworking machine on which several power tools are mounted according to the present invention. 7

Figure 2 is a greatly enlarged fragmentary View, partly in cross section, of a power tool and its adjustable support.

Figure 3 is a. cross sectional view taken along line 3-3 of Figure 2.

Figure 4 is a cross section taken along the line 44 of Figure 3.

Figure 5 is a cross section taken along the line 5-5 of Figure 4.

Figure 6 is an enlarged perspective view of the locking stem.

Figure 7 is an enlarged perspective view of the locking wedge.

The woodworking machine shown in Figure 1 is generally conventional. It includes a frame 10 having upwardly projecting columns 11 and 12 which support a horizontal bed 13 over which a slat conveyor 14 is driven. Work pieces, such as wood panels 15, or the like, are fed by conveyor 14 in the direction of arrow 16 and are clamped between the conveyor 14 and the upper conveyor 17 for passage through the machine and past various power tools which perform on the work various sawing and dadoing operations, such as scoring, grooving, edging, etc. The power operated heads or tool portions of these power tools are indicated by reference characters 20-25.

A typical dado tool 25 is shown in greatly enlarged elevation in Figure 2 and conventionally consists of discs 26 and 27 between which bits 28 are clamped, the discs being mounted on the arbor or shaft 29 of an electric motor 32. The motor has feet 30 mounted on pivot means such as the turntable 33 which has a hollow spindle 34 rotatably journaled in the bearing opening 35 of carriage 36. The carriage 36 is movable rectilinearly along a way 37 with which the carriage 36 is in dove tail sliding connection at 38, 39.

The way 37, moreover, is bodily movable in a direction transverse to the path of reciprocation of carriage 36 on way 37 by reason of transverse dove tail mounting.

connection at 51 to the carriage 36 and is in threaded, connection with the nut 52 which is fastened by means of the screws 53 (Fig. 2) to the way 37'. Accordingly, by manipulating the wheel 48 the carriage 36 can be adjusted rectilinearly on way 37.

One end of shaft 46 is provided with a worm 55 which:

meshes with the worm wheel 56 which is keyed at 57 to the turntable spindle 34. Accordingly, rotation of hand wheel 54 keyed to the other end of shaft 46 will rotate the power tool about the axis of the turntable,

33. The carriage 36 has a bearing surface or shoulder 58 upon which the bearing surfaces of the turntable may rotate but against which it is normally frictionally clamped by appropriate setting of wedge 61 to lock the turntable in any desired position.

The spindle 34 of the turntable 33 is hollow at 62 and counter sunk at 63 to receive a .lockingstern 64 which has an enlarged head 65 which seats in the recess. 63. Near its lower end the stem 64 is provided with a removable cap 66 fastened to the stem 64 by a bolt 67. Diametrically opposite side portions of the stem 64 are relieved at 68 to provide notches within which the flanges.

71 of the wedge 61 are received. Wedge 61 has an operating stem or rod 72 by which it may be moved transversely with respect to the axis of the stem 64.

The flanges 71 are wedge shaped and include surfaces 73 which are inclined to the direction of movement of the wedge. These inclined surfaces bear upon the correspondingly inclined shoulders 74 of the stem cap 66 which are exposed thereto by notches 68. When the wedge 61 is shifted toward the left in Figure 4, surfaces 73, 74 will tighten and the stem 64 will be shifted axially in a direction to draw the turntable 33 into frictional engagement with the surface 58 of carriage 36. The friction developed between these parts when the wedge is fully engaged is sufficient to lock the turntable against rotation on its spindle and hence lock the power tool in any angular position desired. Carriage surface 58 is provided with angular graduations 75 which may be correlated with the indicator 76 on the turntable for accurate angle setting of the tool with respect to the carriage and work.

Rod 72 for wedge 61 is shifted by manipulating handle 77 which is threaded into an oscillatory stem 78 having an eccentric connection with pin 81 seated in link bar 82 into which the end of rod 72 is threaded at 83. Accordingly, manipulation of the handle 77 will rotate stem 78 to slide wedge 61 as aforesaid. The wedge 61 can thus be shifted between one position in which the turntable is free for rotation and another position in which the turntable is locked against such movement.

In the foregoing structure the power tool is bodily adjustable rectilinearly in transverse directions and is also angularly adjustable about the axis of turntable 33. Accordingly, the head of the power tool can be disposed Patented J an. 5, 1960,;

in any desired position for coaction with the work 15.

I claim:

1. An adjustable mount for a power tool comprising a turntable on which the tool is rotatable, a first way on which the turntable is movable and a second way transverse to the first way on which the first Way is movable, said turntable'beingmounted on a carriage, said carriage and first Way being connected by a lead screw for adjusting the carriage with respect to the way, said turntable being provided with a gear, and another gear meshing with the turntable gear and having an operating rod coaxial with said lead screw.

2. The device of claim 1 in further combination with a turntable clamp and a wedge actuator for said clamp.

3. In a device of the character described, the combination with a power tool, a tool support and means for moving the tool with respect to its support to position the tool for appropriate coaction with the work, said means including pivot means and a lock for said pivot means including a wedge movable between one position in which the pivot means is free for pivotal movement and another position in which the wedge frictionally locks the pivot means against pivotal movement.

4. The device of claim 3 in which said pivot means further includes a gear, a worm meshing with the gear and means for rotating the worm for adjustment of the power tool, said lock being adapted to immobilize said gear and worm against turning when the wedge is in said other position.

5. The device of claim 3 in which said lock comprises a stem coaxial with said pivot means and having shoulder means slidably engaged with said wedge, and a fixed shoulder against which said pivot means may be urged by axial movement of the stem for frictionally locking the pivot means when said wedge is in its said other position.

6. The device of claim 5 in which said stem is provided with oppositely disposed undercut shoulders, said wedge being provided with oppositely disposed flanges engaged with said stem shoulders, said flanges being inclined to the direction of movement of said wedge.

7. The device of claim 6 in which said stem is provided with a removable cap, the stem being relieved at its junction with said cap to constitute said shoulders.

8. In a device of the character described, the combination with a power tool, a tool support including a way, a carriage movable along said way and a turntable rotatable on said carriage and on which said tool is rotatable with respect to the carriage, coaxial screw means respectively for moving the carriage rectilinearly along said way and rotating the turntable on said carriage, and a clamp for said turntable.

9. The device of claim 8 in which said turntable clamp comprises a stem coaxial with said turntable, said carriage having a fixed shoulder against which said turntable is frictionally bound upon axial movement oi the stem, a wedge engaged with said shoulder and means for moving the wedge in a direction transverse to the axis of stem movement.

10. The device of claim 9 in which said wedge is provided with an actuating arm, handle means for actuating said arm including a rotor having an eccentric connection to said arm.

11. In a device of the character described a turntable clamp comprising a stem mounted on the axis of turntable rotation and having oppositely disposed shoulders, 21 wedge comprising spaced flanges engaged with said shoulders, means for moving the wedge transverselyto' the axis of turntable rotation, said flanges being inclined to the direction of wedge movement whereby to cause axial movement of said stem.

12. The device of claim 11 in which the stem is provided with a removable cap on which said shoulders are formed, the portion of the stem adjacent thereto being relieved to receive the wedge flanges.

References Cited in the file of this patent UNITED STATES PATENTS 1,522,604 Torlinski Jan. 13, 1925 1,674,602 Madsen June 19, 1928 1,735,990 Belnap Nov. 19, 1929 2,118,063 Alward et al May 24, 1938 2,221,638 Indge NOV. 12, 1940 2,258,828 Trebert Oct. 14, 1941 2,471,014 Trebert May 24, 1949 2,628,643 Tompkins Feb. 17, 1953 

